| A | B |
|---|
| the tiny particles that make up an atom | protons, electrons, & neutrons |
| two or more atoms joined by chemical bonds | molecules |
| the building blocks of matter | atoms |
| matter made up of only one kind of atom | element |
| a particle with a positive electrical charge | proton |
| a particle with a neutral electrical charge | neutron |
| a particle with a negative electrical charge | electron |
| the center of an atom | nucleus |
| whose theory explained that electrons orbit around the nucleus of an atom | Bohr |
| any atom in an element... | has the same amount of protons in it's nucleus |
